giesler



(No Model.) 2 Sheets8heet 1 A. GIESLER.

GAS COMPRESSOR.

No. 556,713 Patented Mar. 17, 1896.-

after OUEWC.

MAKE/#7555135 U8 @7 TTUEIT H-T' YW in 'P wz No Model.) 2 Sheets-Sheet 2.

A. GIBSLER.

GAS COMPRESSOR.

No. 556,718. Patented Mar. 17, 1896.

MEIER;

$7M! \TTE! BY w m m m UNITED STATES PATENT Fries,

ARTHUR GIESLER, OF DAYTON, OHIO, ASSIGNOR TO THE STHAVELL-IMERGE & SMITH-VAILE COMPANY, OF SAME PLACE.

GAS-COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 556,713, dated March 17, 1896.

Application filed October 3, 1895. $erial No 564,501. No modeiJ i To all whmn it may concern.-

Be it known that I, ARTHUR GIESLER, of Dayton, county of Montgomery, State of Ohio, have invented a new and useful Improvement in Gas-Compressors; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in gas compressors or pumps for use in connection with machinery for pro ducing cold, and known in the art as refrigerating or ice-making machines of the character that employ as that is subject to liquefaction under mechanical compressionfor example, anhydrous amm oniacal gasolie subsequent expansion of which produces the refrigerating agent.

Heretofore it has been diilicult to construct a gas-compressor with a capacity for making small quantities of ice without correspond ingly decreasing the efficiency of the compressor, and so far as I am aware this inefticiency and difficulty have been largely due to the general construction of the compressor and the multiplicity of parts and their connections.

One of the objects, therefore, of this invention is to overcome the above objections and defects by providing an efficient gas-compressor and one that has a capacity for pumping dry gas.

A further object of said invention is to provide a compressor the moving parts of which are comparatively few in number and practically free from undue friction, in order that the same may require little or no attention during the operation of the machine.

In the attainment of these objects the said improvements have reference to means for sealing the oil and gas chambers without the use of a stuffing-box. The said improvements have a further reference to the employment of the fewest possible number of moving parts between the crank-shaft and the piston and to the construction of said piston.

Referring to the annexed drawings, which form a part of this application, Figure 1 is a sectional elevation of my improved duplex gas-compressor. Fig. 2 is a sectional elevation at a right angle to Fig. 1.

In the specification similar letters of refer ence will denote corresponding parts in the different views.

As one piston-cylin der, piston, and adj unct iVc devices are counterparts of the other, the specification will be confined to a description of one side of the pump.

A designates the housing, which is inclosed at the top by a water-jacket A, havin g inlet and outlet ducts q and q. The lower portion of said housing has a crank-chamber 15 that is inclosed by bonnets A" and is adapted to contain a quantity of oil 13, to the height substantially as shown, and in which the cranlc shaft is submerged. O designates said crankshaft, which is journaled in hearings on said bonnets, and D is the piston-cylinder, which occupies a position to one side of the crankshaft, as shown in Fig. 2. This cylinder has an annular flange D, which rests upon and is made secure to the upper end of the housing, and a lower flange b that abuts with an annular projection on the interior of the housing. The lower end of said cylinder extends downwardly in p roximity to the oil and is provided with ports l' 1', through which the oil that is splashed upwardly from the oil-chamber may pass to the upper part of the connectingrod. \Vhen the said cylinder is placed in position there is formed a gas-chainberf that is outwardly-inclosed by a cover Z)", the inner edges of which are sealed to the exterior of said cylinder. Gas is inducted from the chamberfto the cylindenchamber 71. through ports 6 eand out through a discharge-valve a to the discln rgc-pipe F.

F designates an induction or suction pipe, which is tapped into the cover b and forms a communication between the chamber f and the freezing-tank. (Not shown.)

E designates the cylinder-head, which is 'is consequently materially reduced.

mounted on the cylinder. This head incloses the seat a for the outlet-valve a, through which the ammoniacal gas is discharged under pressure.

a is an annular gas-chamber or duct extending around the interior of the cylinder head and coninnunicating with the valve-seat c, from whence gas passes to the dischargepipe F through a channel a", as is shown in broken lines in Fig. 2. The extent of the movement of this valve is governed by the space'i between the upper end of said valve and the cap Z). The piston I has its middle portion reduced in diameter and provided with oblong ports 5, through which gas is inducted to the piston-chamber s.

g is a concaved diaphragm which separates said chamber 8 and through the center of which there is a port or opening 0, through which gas may pass to the chamber 13 until the volume and pressure of the gas therein equals that in the cylinder. Incidentally the opening 0 also affords a passage for any oil that might find its way up the sides of the piston to return to lubricate the wrist-pin and connecting-rod. The said connecting-rod has itsupper end projecting into the lower end of the piston and is connected directly thereto by the wrist-pin. The lower end of said connecting-rod is connected to the crank-shaft C, which, as hereinbefore stated, is out of alignment with the vertical center of said piston, so that the lines of force exerted by the connecting-rod will be tangential or on an angle to the center of said piston, and the amount of strain 011 the piston connections 0 is a valve-seat in the upper end of the piston, and in which an inlet or suction valve 0 is placed, the lower end thereof being inclosed by a locknut 6. Upon the downstroke of the piston gas will pass through ports 1', above the valve 0, and upon the upstroke said gas is forced through the discharge-valve a. A uniform pressure above and below the valve 0 is created upon the downward movement of the piston. Therefore the said valve is enabled to seat itself by gravity. g designates two series of sealing-rings surrounding the piston. The upper series of these rings form a seal to prevent the passage of gas from the upper part of the chamber it, while the lower series form a seal between said chamber and the oil chamber that effectually prevents any communication between said chambers after the oil-chamber has received an amount of gas equal to the pressure in the chamber h. The pipes constituting the freezing system are therefore kept free from accumulations of oil and a more eflicient freezing capacity is maintained, and, further, the compressor is enabled to run with gas that is unmixed with oil and is in an absolutely dry state.

To more particularly illustrate, a brief description is given. Assuming that the compressor is about to be started, the gas-chamber f is supplied with gas under suction-pressure from fifteen to thirty pounds, this being the most desirable pressure. The upward movement of the piston will create suction below it, and continuing will compress gas above it and discharge the same through the valve a to the pipe F. The oil-chamber at the start being free from gas, the continuous movement of the piston will cause a certain quantity of gas to pass the lower sealing-rings g and through the port 0 until the volume or specific gravity of the gas thus entering the oil-chamber equals that in the cylinder or gaschambers h. lished, all communication back and forth between said chambers ceases, and the com pressor is in a condition to furnish a dry and pure refrigerating agent to the freezing system. A further advantage maybe mentioned as attainable by thus supplying the oil-chamher with gas to equal the suction-pressure, namely: The crank-shaft bearing will be relieved by said pressure on the upward stroke of the piston in exact proportion to the amount l of pressure exerted on said piston by the gas in the chamber h. This upward pressure on the piston, it will be observed, is obtained at a time when most neededto wit, when the strain is put upon the crank-shaft. Consequently the strain thus put upon the pistonbearings and the crank-shaft relieved.

Having fully described my invention, 1 claim- 7 1. In a gas-compressor, the combination with the housing providing an oil-chamber B and the piston-cylinder, of a singleacting piston provided with a chamber separated from the oil-chamberbya concaved perforated diaphragm, a suction-valve in the upper end of said piston, a connecting-rod projecting into the lower end of said piston and connected thereto and to the crank-shaft, a series of sealing-rings on said piston whereby means are provided for establishing an equilibrium between the oil and gas chambers which enables the pumping of dry gas.

2. In a gas -compressor, the combination with a piston-cylinder, an exterior gas-chamber, and ports 8 c communicating therefrom with the cylinder-chamber, and a dischargevalve mounted on the upper end of said cylinder, of a piston having its upperportion hollow, and oblong ports communicating therewith, a suction-valve seated in the upper end of said piston, a connecting-rod projecting into the lower end of said piston, and sealingrings carried on the piston below the oblong ports, whereby means are provided for sealing the oil and gas chambers from each other without the aid of a stuffing-box, substantially as described.

3. In a gascompressor, the combination with cylinder, and an exterior gas-cha mber \Vhen this equilibrium is estabi will be greatly POO IlO

having ports communicating with said cylinder, of a piston having; its central portion of a smaller diameter and provided with a gaseha-mber with ports communicating with the cylinder, a eoneaved diaphragm forming the bottom of said chamber and provided With a port in its center, m1 oil-chamber below the piston, an upwardly-opening suction-Valve seated in the upper end of said piston, and 21 discharge-Valve seated vertically above said 10 suction-valve, substantially as and for the purposes specified.

In testimony whereof I have hereunto set my hand this Bth day of September, 1895.

ARTHUR GIESLER. \Vitnesses:

R. J. MCOARTY, IRVING LONGENECKER. 

